1. Today’s Agenda 10/13/15 Return: Minor Celebration of Knowledge- Chemistry Reading Chemical Formulas- Notes & Station Activity -----------------------------------------Homework: Practice with chemical formulas 3C 4 H 10 CH 3 OH 5Na 2 SO 4 Include elements, atoms,, molecules, ball and stick models

2. All About Matter Chemical Formulas

3. An Atom

6. Coefficient Large numbers in FRONT of a formula Indicates how many molecules of a substance there are To count the TOTAL number of atoms, you must multiply everything in the formula by the coefficient

7. 2H 2 O What is this? Refers to the Hydrogen Tells us how many of the element subscript What does it tell us?

8. 2H 2 O What is this? Refers to the MOLECULE Tells us how many molecules coefficient What does it tell us?

9. 2H 2 O Two molecules of water have a total of 4 hydrogens 2 oxygens (2x1=2) (2x2=4)

10. Let’s Practice 1.Identify the elements in this compound. 1.How many molecules are represented in this chemical formula? 1.How many atoms of each element are present in this chemical formula? Carbon & Hydrogen 4

11. What is this called? 5C 6 H 12 O 6 COEFFICIENT coefficient is a number that is placed in front of a chemical symbol or formula

12. chemical formula 5C 6 H 12 O 6 How many carbons in sugar? Hydrogens?Oxygens? 5x6 =30 5x12= 60 5x6=30

13. Ball & Stick Station Activity Get your paper for the day Get your paper for the day You will create ball and stick models of different compounds! Be sure to draw the ball and stick model and identify the parts of the chemical formula BEFORE you move on to the next station.

14. Today’s Agenda 10/14/15 1.Correct Last Night’s Homework 2. Review Yesterday’s Compound Modeling Lab -----------------------------------------Homework: Reflection on reading chemical formulas. GLUE it in!

15. Homework Review 3C 4 H 10 Elements: _____________________ ____ molecules of the compound ____ molecules of the compound ____ atoms of Carbon ____ atoms of Hydrogen 3 Carbon & Hydrogen 12 30

16. Homework Review CH 3 OH Elements: _____________________ ____ molecule of the compound ____ molecule of the compound ____ atom of Carbon ____ atoms of Hydrogen ____ atom of Oxygen 1 Carbon, Hydrogen & Oxygen 1 4 1

17. Homework Review 5Na 2 SO 4 Elements: _____________________ ____ molecules of the compound ____ molecules of the compound ____ atoms of Sodium ____ atoms of Sulfur ____ atoms of Oxygen 5 Sodium, Sulfur & Oxygen 10 5 20

18. H2OH2OH2OH2O 2 elements Hydrogen Oxygen 2- Hydrogen 1- Oxygen 1

19. 5H 2 O 2 elements Hydrogen Oxygen 10- Hydrogen 5- Oxygen 5

20. CO 2 1 2 elements Carbon Oxygen 1- Carbon 2- Oxygen C O O

21. C 6 H 12 O 6 1 3 elements Carbon Hydrogen Oxygen 6- Carbon 12- Hydrogen 6- Oxygen

22. 3N 2 1 element Nitrogen 6- Nitrogen 3

23. 2NH 3 2 elements Nitrogen Hydrogen 2- Nitrogen 6- Hydrogen 2